Electric Vehicle Torque Redistribution for Hill Climbing Traction
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Solution Overview
Problem
Electric vehicles, particularly trucks, face difficulties in adapting to unusual driving conditions such as climbing hills or getting stuck in mud pits due to uniform torque distribution between front and rear axles, which can hinder performance.
Innovation Solution
A control unit adjusts torque distribution between the front and rear axles or individual wheels based on driving conditions, such as slope detection and wheel slip, to optimize torque allocation for improved adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If torque is distributed uniformly (1:1 ratio) to front and rear axles during normal driving, then the vehicle can be driven smoothly with simple control, but the vehicle cannot effectively handle unusual driving conditions such as climbing hills or getting stuck in mud pits
Solution Approach 1:
The patent implements dynamic torque distribution by enabling the control unit to adjust the torque ratio between front and rear axles based on detected driving conditions. Instead of a fixed 1:1 distribution, the system dynamically modifies torque allocation (e.g., increasing rear axle torque during hill climbing or when wheels are stuck) to adapt to varying operational requirements, thereby resolving the contradiction between simplicity and adaptability.
2Reliability
If torque is redistributed to improve climbing ability and traction in unusual conditions, then the vehicle's performance in challenging conditions improves, but the control system becomes more complex requiring detection of driving states and conditional logic
Solution Approach 1:
The patent employs feedback mechanisms by using sensors to detect driving conditions (such as wheel slip, acceleration patterns, or terrain characteristics) and feeding this information back to the control unit. The control unit then adjusts torque distribution based on this feedback, enabling improved reliability in challenging conditions while keeping the control logic manageable through condition-based responses.
3Power
If the total torque meets the requirements for hill climbing but is distributed 1:1 to front and rear axles, then the overall power is sufficient, but the vehicle still cannot complete the climb due to improper torque allocation
Solution Approach 1:
The patent applies local quality by distributing torque differently to front and rear axles based on specific driving conditions. Instead of uniform distribution, the system allocates higher torque to the rear axle during hill climbing scenarios (where rear wheel traction is more effective) or to the front axle when front wheels have better grip, thereby optimizing the use of available total torque for specific operational needs.
Data Source
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Figure 3
AI summary
The invention discloses a method for redistributing and adjusting torque of an electric vehicle (1), wherein the electric vehicle (1) at least comprises a first electric drive (17) for a front axle (11) and a second electric drive (18) for a rear axle (14), the method comprising at least the steps of: determining whether the electric vehicle (1) is in a driving state requiring redistribution of torque; and adjusting the torque initially distributed to the front axle (11) and/or the rear axle (14) or the torque initially distributed to the respective wheels by controlling the first electric drive (17) and/or the second electric drive (18) if it is determined that the electric vehicle (1) is in the driving state requiring redistribution of torque. In addition, further disclosed are a corresponding control unit (19) for an electric vehicle (1), a corresponding computer-readable program medium and a corresponding electric vehicle (1). Better torque distribution can be made for specific driving states.